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Pistons

Pistons

General data

Engine B207E/B207L/B207R
Compression ratio 9.5:1
Nominal compression (bar) 14.5
Min. compression (bar) 12.4
Piston play nominal (mm) 0.013 - 0.047
Piston speed at 5000 rpm (m/s) 15.8


Important

Pistons of different makes must not be used in the same engine. The piston make is cast onto the piston.


Piston types


The piston diameter is measured perpendicular to the piston pin and 9mm from the piston base

Engine R Ø A H B d1 H d1
B207E/B207L/B207R mm 30 85.961 - 85.979 5.36 53.00 5.6 49.13 55.36


Pistons

Piston class and cylinder travel

The pistons for B207E/B207L/B207R only have one class

The cylinders in B207E/B207L/B207R only have one class


Piston rings

B207E/B207L Upper compression ring Lower compression ring Oil scraper ring
Thickness mm 1.170 - 1.190 1.475 - 1.490 2.38 - 2.46
Play in groove mm 0.04 - 0.08 0.020 - 0.055 0.050 - 0.150
Cylinder gap mm 0.15 - 0.35 0.400 - 0.600 0.25 - 0.75
B207R
Thickness mm 1.170 - 1.195 1.470 - 1.495 2.38 - 2.46
Play in groove mm 0.035 - 0.08 0.015 - 0.060 0.050 - 0.150
Cylinder gap mm 0.15 - 0.35 0.400 - 0.600 0.25 - 0.75



Piston pin

Diameter mm 22.995 - 23.000
Play, piston pin-bearing vertical (oval hole) mm 0.004 - 0.015
Play, piston pin-bearing horizontal (oval hole) mm 0.034 - 0.065
Play, piston pin-connecting rod mm 0.012 - 0.022
Length mm 63